On Wed, Sep 23, 2009 at 12:22:32PM -0700, Jeremy Fitzhardinge wrote:
> On 09/23/09 05:06, Konrad Rzeszutek Wilk wrote:
> > I've gotten my hands on machine with SB700 and it exhibits similar 
> > problems. The 
> > SB700 AHCI controller stops working if I have more than 4GB in the machine.
> > 
>
> You mean just with this kernel? I presume it works OK normally.
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1514
has the details.
It looks that the calls to ioremap_nocache return an address
that is not synchronized with the physical address.
This is exhibited only when dom0 has more than 4GB, so if you do dom_mem=max:4GB
the machine boots succesfully.
If I boot the machine without Xen, with Linux seeing 8GB, 4GB, 6GB, or whatnot, 
it
boots succesfully.
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